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1hlo

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Revision as of 02:46, 11 September 2015

THE CRYSTAL STRUCTURE OF AN INTACT HUMAN MAX-DNA COMPLEX: NEW INSIGHTS INTO MECHANISMS OF TRANSCRIPTIONAL CONTROL

Structural highlights

1hlo is a 4 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[MAX_HUMAN] Transcription regulator. Forms a sequence-specific DNA-binding protein complex with MYC or MAD which recognizes the core sequence 5'-CAC[GA]TG-3'. The MYC-MAX complex is a transcriptional activator, whereas the MAD-MAX complex is a repressor. May repress transcription via the recruitment of a chromatin remodeling complex containing H3 'Lys-9' histone methyltransferase activity.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

BACKGROUND: Max belongs to the basic helix-loop-helix leucine zipper (bHLHZ) family of transcription factors. Max is able to form homodimers and heterodimers with other members of this family, which include Mad, Mxi1 and Myc; Myc is an oncoprotein implicated in cell proliferation, differentiation and apoptosis. The homodimers and heterodimers compete for a common DNA target site (the E box) and rearrangement amongst these dimer forms provides a complex system of transcriptional regulation. Max is also regulated by phosphorylation at a site preceding the basic region. We report here the first crystal structure of an intact bHLHZ protein bound to its target site. RESULTS: The X-ray crystal structure of the intact human Max protein homodimer in complex with a 13-mer DNA duplex was determined to 2.8 A resolution and refined to an R factor of 0.213. The C-terminal domains in both chains of the Max dimer are disordered. In contrast to the DNA observed in complex with other bHLH and bHLHZ proteins, the DNA in the Max complex is bent by about 25 degrees, directed towards the protein. Intimate contacts with interdigitating sidechains give rise to the formation of tetramers in the crystal. CONCLUSIONS: The structure confirms the importance of the HLH and leucine zipper motifs in dimerization as well as the mode of E box recognition which was previously analyzed by X-ray crystallography of shortened constructs. The disorder observed in the C-terminal domain suggests that contacts with additional protein components of the transcription machinery are necessary for ordering the secondary structure. The tetramers seen in the crystal are consistent with the tendency of Max and other bHLHZ and HLH proteins to form higher order oligomers in solution and may play a role in DNA looping. The location of the two phosphorylation sites at Ser1 and Ser10 (the latter is the N-cap of the basic helix) suggests how phosphorylation could disrupt DNA binding.

The crystal structure of an intact human Max-DNA complex: new insights into mechanisms of transcriptional control.,Brownlie P, Ceska T, Lamers M, Romier C, Stier G, Teo H, Suck D Structure. 1997 Apr 15;5(4):509-20. PMID:9115440^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Brownlie P, Ceska T, Lamers M, Romier C, Stier G, Teo H, Suck D. The crystal structure of an intact human Max-DNA complex: new insights into mechanisms of transcriptional control. Structure. 1997 Apr 15;5(4):509-20. PMID:9115440

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1hlo"

@@ Line 2: / Line 2: @@
 <StructureSection load='1hlo' size='340' side='right' caption='[[1hlo]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[1hlo]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HLO OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1HLO FirstGlance]. <br>
+<table><tr><td colspan='2'>[[1hlo]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HLO OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1HLO FirstGlance]. <br>
-</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1hlo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1hlo OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1hlo RCSB], [http://www.ebi.ac.uk/pdbsum/1hlo PDBsum]</span></td></tr>
+</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1hlo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1hlo OCA], [http://pdbe.org/1hlo PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1hlo RCSB], [http://www.ebi.ac.uk/pdbsum/1hlo PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 25: / Line 25: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 1hlo" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>
 __TOC__
 </StructureSection>
-[[Category: Homo sapiens]]
+[[Category: Human]]
 [[Category: Brownlie, P]]
 [[Category: Ceska, T A]]

1hlo

From Proteopedia

Revision as of 02:46, 11 September 2015

THE CRYSTAL STRUCTURE OF AN INTACT HUMAN MAX-DNA COMPLEX: NEW INSIGHTS INTO MECHANISMS OF TRANSCRIPTIONAL CONTROL

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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